Overview

The Radioduino is an Arduino clone. It features an ATMega328P and a RFM73 transceiver, which allows multiple devices to communicate with each other. The ATMega328P has a preloaded Arduino-bootloader, so this board can easily be programmed with the Arduino-IDE.

Programming & Library

The USB-Port can be used to supply power to the Arduino, it is NOT for programming. The ATMega328P has a preloaded Arduino-bootloader, so all you need is a USB-Serial adapter.

There is a simple library for the RFM73 radio module, you can find it here: https://github.com/heye/rfm73

Sending & Receiving

This is an example on how to send simple data. The text "hello!" is transmitted every 100ms.

void setup(){  
  //initialize the RFM73 module
  RFM.Begin(); 
}

void loop(){  
  //send some text with length 6, the max length is 32 bytes!
  RFM.send((byte*)"hello!", 6);
  delay(100);
}

The following example waits for transmissions and prints the result on a serial connection.

void setup(){ 
  //start the serial connection 
  Serial.begin(19200);

  //initialize the RFM73 module
  RFM.Begin(); 
  //register the callback function
  RFM.onReceive(receiveEvent);
}

void loop(){    
  //the tick function checks for any received data and calls the receiveEvent
  RFM.tick();
  delay(10);
}

void receiveEvent(void){
  //print received data
  Serial.println((char*)RFM.getRcvBuffer());
}

Details

The Atmega328 runs at 3.3V

• Controller: ATmega328P
• Clock Speed: 8MHz
• RAM: 2KB
• Flash: 32KB
• Operating Voltage: 3.3V
• Input Voltage: 5-7V (micro-USB or raw input pin)
• Radio module: HopeRF RFM73 2.4GHz
• Size: 20.6mm x 36.3mm

Eagle schematic & boardfile

IO & 2.4GHz radio

The pins MISO, MOSI, SCK, D2, D8 and D10 are used for communication with the radio module and should not be used in your own sketches. These pins are underlined on the silkscreen.

Use Cases

These boards can be used wherever you need some wirelessly connected Arduinos.